Nobel’s furniture design was dynamite | Letters
One-legged stools | Mercia mudstone | Death by fish | Lancia cars | Naming your cold
All this discussion about the relative design and merits of three-legged stools (Letters passim) is as nothing compared with the so-called suicide stool, a one-legged stool designed by Alfred Nobel to prevent operators of the nitroglycerin reaction vats – part of the production process of his dynamite – falling asleep and allowing an exothermic runaway to occur, with the consequent explosion ruining everyone’s day.
Thornton Cleveleys, Lancashire
• Graham Thompson needs to be careful referring to the Keuper marl rock formation as a defining “north/south” feature (Letters, 21 October). I was recently admonished by a geology expert for using this term. “We now call it Mercia mudstone,” I was told. But marl or mudstone aside, north of the Trent is True North.